I loved that! I can't imagine what Sinestro or the rest would make of that guy, but what a nice, weird tie-in!

"Maybe to Young Clark, all his victims are "just comic book characters"...? I like seeing things from his perspective."

I think that's really it! There's a lack of empathy in both directions, because of the characters' different perspectives. From Superboy Prime's perspective, they're all just comic book characters... and badly written ones, to boot! For him it probably doesn't feel all that different from doing "bad" stuff in a video game... not like anyone's *really* getting hurt!

But of course the heroes don't see our Earth-Prime as being any more or less real than theirs, which makes Superboy Prime monstrously evil in their eyes. I actually felt for the guy a little in this special - he might be redeemable, even... but most likely not by leaving him locked up in a red-sun prison 24/7 to stew in his own crazy....